Exemption from long term capital gain

ravi thanvi (self practice) (74 Points)

22 March 2018  

My cousin has a long term capital asset being a plot of land which he sold in dec. 2017 above stamp value for Rs.20,50,000 . he acquired another plot of land 

(he had made agreement to purchase and payment made in full, but no registry yet)for Rs.7,70,000 and also made expenses on improvement of existing house property for about Rs 500000/-

please tell in which section exemption can be claimed and tax planning can be done.

please help